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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'becfd5fd442e54640f91e05281a89077b2efadbbcf17e9d1b5c142519e72b2aa' 
  AND token = '4E4W/FBOCMrTIj1mQchCwVdS2Pp5RL1dVGOgDvTf2Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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