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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d0bd4a148f05d2a261657beac082a9d3abdfc89ac6bd9d713c8aa261b25b1c' 
  AND token = 'W59KecOoIjN9pEPSzMg4jJ6Y2QDYTMFz9nNiE+NJ9y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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