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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f10f93c45dec68e56b38f309c43986064ed364c9f781b586ae17bbc09a58ec54' 
  AND token = 'waNytH1R07tOU4QSD8VpVbjVX10iZSsInLuBq9/IcvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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