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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f92c2f189e6c8dfe7ecc3e03229c8b0896a82d3cfa812cab93f3056277167be3' 
  AND token = '5SHncKGI1ciG6rbYUkgPTkPQzfZnu8DNcRYB+lmAoOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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