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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6efbc5ef193bf9be53d910b51eb8eaa4d097439c898a732d89facd218add5dc' 
  AND token = '5xUBspIIbgGx5LnPtd7/DqF/xZVHoZqAyqwLVKho1/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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