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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65c4b94d619a93083ff549aacb6a68d4924a8496fdcb8447dbd59130ca3af604' 
  AND token = 'OG0KR5fYz4lUbNvUZRKRrlKv5MT70quMdU2T6bXdPYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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