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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e7870350e2576c2f3d2506b354a33c19f9dde197c8146441458fd3743603aa' 
  AND token = 'QSoPTmfdxJpMaDS8AvceE/Z/e1BMpJ2aRhDVECXKWuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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