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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '616ef0c7087335eaab83e03de23a1c426ed2342dd5536c57bc6f556cb61e314a' 
  AND token = '3jh2jfW7tujcrifSudD3M/Qtx3BqlXDPcspNVtf5Gh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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