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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16a27a273248f50c39ecbb7e175dfd0985d7cbffc71f90778abded53c1004ee7' 
  AND token = '2ns4UzdRhxIiUmq/0372Boic6p0Y1zFMD+7lt6mSh5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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