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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '446b74debceec8b546f96a420162d57a6d75ccdead0cf606e6c8cdb8f28927d5' 
  AND token = 'iMAxemfS+iFNfTF9Kp1CugCSZUW1dPrsueqHiVRlguk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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