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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '359cead19641912a570ced54adad38c3909b2dfb13321394a6af51fac9b2ca31' 
  AND token = 'esTJ8L+akNOiFa5FMAZiFQ2vmO/MUCwiFVFbX5+aaXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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