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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1026087e5497798bba7769a39141b50f86cfab3f54e5547e763e16e0f4731d60' 
  AND token = '/CHmc+e25tMbje6fV7G1uiFRq9KtEa5iZ/kZgkBxMck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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