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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '167e5958721c33b537c96277810386f7b2b4b520801a0ac4df1909d4ea1ade6c' 
  AND token = '+vND0VxYaph/90TRmKZWw/e/8oCGS18GNwHIi7xG6yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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