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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d1c7d6d5172218502d538c9c8b15fe06e6c11cbfa068fcb86f80d288f8a709' 
  AND token = 'eyNgaN91uFx9W01+1vJSULIPeaV/c3Egq0NFp7L4j6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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