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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac993f1cd09d4b4b2cfbe0c8c9b01cfc240053dc1c8c75440049aa4515287db' 
  AND token = '5gbzTVNc2Pbek18AlYe18cwwbWRB8GOc5tLLxLceCWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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