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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec1894de00fc5c909979c21bcb21f36405c7c901c5baf9ab5af5fec2839a260' 
  AND token = 'KK/vtylUbyo1EOg1tG/xo4w46qXjHAqrj0VW1xZoQLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}