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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc3ca5a75fde610988ede1acd4e500fe0ee71a5596e8a3664bdc2a5933ffc86' 
  AND token = '8e8ND2+i/4TBquOr3hdOfjBsvKzqyX1Rp0Ty9TDNJs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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