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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55aba131cb20f400936ad44bd761bb006b763432d97cf48e1d5af2a67a6d9d25' 
  AND token = 'JwLySEdI0vp42pGlJy6WfE5qKYW9iWr7dxJNxXd9+sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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