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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c44e5509ec04c6328393503e19bdcd7df408e4af9482f5f94157f52dbbb0216' 
  AND token = '4Mq4CZMUIGuLXQe6SbomGNdE9FdAj/PWsbeEWPSx1tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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