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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68192485b88e687e6575afaf8c1275ce199765e7f457d595ec2e60e0b9328a16' 
  AND token = 'AWPkp3U/6pDP4TJxCYYhkkoAhfNpvIflNlCm72dyQtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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