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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d05c332a841b7cdc8b8de624d0f3c35bcd6008af164aff98ee3cb11b4585688' 
  AND token = 'm9gt6tUSRwIad8m3LulLlOpWKpOIQ3VcS5NZM4EjKYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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