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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49b2fa05421af9d63c4a55765e8785886ac1435d15f320da79ec7565335b46f5' 
  AND token = 'Z24fFstFqLM/2NsiOcH2MSCPrX/DRy9YJMhU9+aMDmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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