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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd115eab10c2a4d1b726e09a7bb03b4b0fce929e1ac82c8a1e02abf63155ba7b2' 
  AND token = 'KaBmos6rfB+gmSdDOt947RjvYWleAVVtjPRFiUzDDqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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