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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917291d4e3f1a0d59cad022b4aaf24348bc0c171fd34c5c867063c6e67dbb570' 
  AND token = 'd1zhF7wfwvPRvUZ5WjcRfOqIVU5HwbDRD8Mr621ctNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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