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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55107a77740150cc538bfa49ccfd6e8e1e024f68f1599c95c3097b961c80cce3' 
  AND token = 'jvpKCkcPocdHb2O1346gONJTKDzxiDRSMf7sZk9aGj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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