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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26bb23c2f95cb6f9da1c4e821d2afa299d9db25bd9d3213b90a24697c1b696d5' 
  AND token = 'E0TkAEOLF6VTz8pREJVLV0UoDabiAcyGP0pRWZa6L3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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