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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67cedc35d8ab26980b2ad5737157a2cd469610dd5326a3b092db842a66c0b7c2' 
  AND token = 'Jem/3Ehwshu9hTNDqqTteRl8aAw//hVZ/O9/a+R/s4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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