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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '885fe0b6d1c617e3eb89d11fe97f4ab7c98d6d785f9e9aba90cc05a171b60feb' 
  AND token = '9j52fm4fZ/lJFlYeUCJy4egs3lsd4pZ2XxM0PVm7YCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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