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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57069c0c31765f31939f85c4599edaee5e8a2232df5240d12b897f08750a8680' 
  AND token = 'vDlddLLkexe1ue7VPyNJy8aX4oiTH0s6veqGJ6xlOgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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