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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a953068e8b44389ce49a2c8a24e730f0a1f7ca576644b96fd7c06b98194b6d3' 
  AND token = '850+kEsmNPzrTK2AjeuWO7B6IZQ3WDrQZzikYt5u4nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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