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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5a89730e37b1516423972de249fc69d138ae72ae0b094e07581003f7f26efc' 
  AND token = 'gl1b9omHeYd0cjgNASWzg8h5fH8oemmmGb78lLJT4T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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