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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcc7588215ef6f702f7ba5702efb38e613d88057ac0883709dfd7394eb461fdb' 
  AND token = 'WzqzLdq94T8XPETsjmQzinNwYb3JsnlythNjp2R6UXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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