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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45395fb1d7dfbdcb1d31df0419ac9bbba317c648e14227844df82eaa5f68f949' 
  AND token = '8+xGxOmYHLrh3xY1J4UMJN3NR2ry/zp2DNbXsnYbly4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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