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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2bfb890f55cebdb045c5a7ab3f7e97ff5a83d8099325ab67d9ba143cef22135' 
  AND token = '7sXJRh7NIh0xcMt8U3bqIqZfliLjxTzihg4S3SAH/tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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