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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b4a87688c63e36fd794b8f03dbf5179453c192c6ec6f1f60be4e44404a9d74' 
  AND token = 'rBg5eJgGlmAvmw+x6G+Ole8KXBX5Jr8aq+bWW6I7yw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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