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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f706e32ecdefa237b7f440246bf56e8f8f0bd389e16109e89af9705d6e8a4523' 
  AND token = 'JcZbNI7I3dbGI5IRD6haoNNB3e40eKwkYwSgQMJthbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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