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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d48e328c18f8cf16be960a07903d13d03f9364791f8792e242e5774b536c033' 
  AND token = 'HCwOn5ztB8Erer3Zma8IVeOuEfvcyvnHgSClrL8tecs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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