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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e66b05ed672c19ea662beedf7dc8c86fba73f729c04ac2cd8098692f02f82d9' 
  AND token = 'CNv0b9TS8uBwBJ3qagIU2t0PCLMkRCDtP8SYAR8CZPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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