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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02728c441a2570c483265356be975abf89b26926eaf40b75cca63db81ea20056' 
  AND token = 'ojXe/Sel6TAtOXISPmT8TWhRCobpzFglf32jA88YHDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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