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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '586cc3ea4c6d8d7a8c4d1ebc3fd123c6736b2aa7160d006427382f998aeba2c8' 
  AND token = 'ksEIFNWTnJmfZ1+TPGh5X7oV9QNZjagb1/T6liFTZ94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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