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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0fcfba4b5d2ba300cf9917cae7396d25215cfc12c12a4559c1c0748fa68d03' 
  AND token = '4cTpv9QFCkPDZgD9js/EQnGWmpIPV3B8G01Geia/D8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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