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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd23d3b402fe9c7c41c9f0198a47cf20e704d6c0fa48c3a910bd51723de9c66' 
  AND token = '7L2JP55YoZNUQpWna1J3jnVslGqgdQbkhIadm/Io6QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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