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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d79d085149790fa32558c18e42e3fbfe73a070ae2ced10af0417910666d3b03' 
  AND token = '75yTaGtgS1cJOg+0e+uMKJ9mY3QWBY5Sc0+ZWAwD/Do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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