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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8056e70a03610e158db6d3e69c69d73e331b617673e436ecdf03207f99fc4296' 
  AND token = 'WvySilmitOwKYi2tvz0ivPEKkftWiBk/PEQMzwD3828=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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