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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65dc0680e5dbbacba7b2d7a18228655207c94efb67dcf6f8c9da23290e1a4bed' 
  AND token = 'h95/g1+s6a9N5ubu5Jk+zToI4epv/j35ci1cT4i9oEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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