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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13475f8a4a2425af59dcffa6455b69bab985d8b606d19681a31aac29c2e0c864' 
  AND token = 'qYPvyqyG8dQWbQq2Lq0fR13i46fGkjecBXXm7lzJDvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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