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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70236935206421d5c4db5e0312afd19585cdcc50062fb8ad932716c822253c3' 
  AND token = '0hctJUI9L0hs7fGfERX/n+/z+WIvxY698lv97O8fd8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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