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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56fb764642933a968d0a774a3ba1bdc492b156df36a66a32a936aaac835f0a98' 
  AND token = 'nNkRmF2BJub5HwuDY8xtODAu0cnLlWAwRq/rTW4HEMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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