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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd929cef969e7520615740d7d6946ab4bc4baa148a5c122495ed65e1c6b34028a' 
  AND token = 'PDWXtoEoqEezA5jkJBy8hQ+iU2qCKpU0Upx6uLAH0AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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