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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a901f80ab2ba944d810715d454366bfead3111d3518a7346fa71aa0122abf1b' 
  AND token = '1XpT1blNhvIHeIilzhtLyw4SMLrq/XxEiirn9LzmKXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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