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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9468852cdbd57a966b159f59528afe4243f55fb5821b7f1c9c5d18ff9419d0' 
  AND token = 'qyAUnEomMN+jnRtM24N7YuAMOoCugUY7MHvmztgF/xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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