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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7a1359d48816f9e3caf875a791a476d7a389bb727f21f4fb15871356b683d8f' 
  AND token = '9kMsc3X1O32ASz9C1xlCgYB3SSg3jJPhbpv5sqBBbm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00166

JSON explain

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