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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5dc3dc050da341e976691baca217f7168ff7538c10d0eb25cc9d6c9fd9fa82b' 
  AND token = '9NaFfnos+ivnKCvCmV984Rvxa9ATKomBkA24alEXfV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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