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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90452af424d5215040edfada09a2aaaf428cb4ac9d06b22838a82bdbc740edbe' 
  AND token = 'IZhyUntu0FzU3E+ahVqSUOI4erejFbc8F80Td8grXlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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