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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed214851f28d8aa67c84657b0ea0c6b9e5562db86e9b7253972f5330a3e43208' 
  AND token = '01h4jx4b5MXPFWwIVkrc4K8qQMWgGkcxV00QbXqmbAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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