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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7ad1c4af4caea8c3848760dd62ef2bdd977f88962aaf78eb1a6cb47539aa1c9' 
  AND token = 'Oy2RnFJCiNGjMe05unM0RImyE/6lo2sQDvgxu0HWMIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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