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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99edd74112f81dbecf96b58c37b86b0941b3b5aedb9eb5c54d443f8a27f2fff' 
  AND token = 'e1P7v34g8dZcd3bl10MuBXLYeXHPyLC2EN8yE98Iuq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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