SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d2d1948f0fa14f47b34434c7626594c9a909e9c0d438fabe61774abee7f5d23' 
  AND token = 'cVSPnxj35QAY10esltRoqZGFwTPkgH7/K4jNbHpz73o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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