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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25cb1471c2bad38a6917a39b27f8e0dd2bbe6a461b5edfdf5e5b6c0bd14c9a86' 
  AND token = 'TJAL+TUKrUX1pjos2m6w35NI63Kdn10TfPzFe9MCg0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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