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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3783a174989ec195e0396ee4fc2fd2f4d9c0e97ec71aaeccffa12cca586b6974' 
  AND token = 'O+0q0W0e6HYchvclcMAJrzE17zlS1sJdS1s1n3qicio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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