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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10cf7f1308298d3e146c57868c424a8ba04836dc04f6a54f0ce2630bb6b637f1' 
  AND token = '7hwl1TvzdeQWg8hJ+QDvtjxeAv32i8Yq22u5prhkpOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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