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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b7fdf1ad3964586838ab4729f1b9f007376f41b9f83b88799d7354f08661387' 
  AND token = 'XRHAUxbeCLDygo1HkvfG7E4yTEe3vjOhgVbx9SJEmQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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